23
A
ENGLISH
Cutting/flaring the pipes
Inclined
Damaged Surface Cracked
Uneven Thickness
1
Make sure that you prepared the required tools.
(pipe cutter, reamer, flaring tool and pipe holder)
2
If you want to shorten the pipe, cut it using a pipe cutter ensuring that the
cut edge remains at 90° with the side of the pipe. There are some examples of
correctly and incorrectly cut edges below.
Oblique
Rough
Burr
3
To prevent a gas leak, remove all burrs at the cut edge of the pipe using a reamer.
4
Carry out flaring work using flaring tool as shown below.
Flaring tool
Clutch type
Wing nut type
A
Die
Copper pipe
York
Die
Copper
pipe
Flare nut
5
Check if you flared the pipe correctly. There are some examples of incorrectly
flared pipes below.
6
Align the pipes and tighten the flare nuts first manually and then with a torque
wrench, applying the following torque.
Outer diameter (D)
Depth of flaring part (A)
Using flaring tool
for R-410A
Using conventional flaring tool
Clutch type
Wing nut type
mm
inch
mm
inch
mm
inch
mm
inch
6.35
1/4
0~0.5
0~0.02
1.0~1.5
0.04~0.06
1.5~2.0
0.06~0.08
9.52
3/8
0~0.5
0~0.02
1.0~1.5
0.04~0.06
1.5~2.0
0.06~0.08
12.70
1/2
0~0.5
0~0.02
1.0~1.5
0.04~0.06
1.5~2.0
0.06~0.08
15.88
5/8
0~0.5
0~0.02
1.0~1.5
0.04~0.06
1.5~2.0
0.06~0.08
Outer diameter
Connection Torque
Flare dimension
Flare shape
[mm(inch)]
mm
inch
N·m
Ibf·ft
mm
inch
6.35
1/4
14~18
10.3~13.3
8.7~9.1
0.34~0.36
90° ±2°
45°
±2
°
R 0.4~0.8
(0.016~0.032)
9.52
3/8
34~42
25.1~31.0
12.8~13.2
0.50~0.52
12.70
1/2
49~61
36.1~45.0
16.2~16.6
0.64~0.65
15.88
5/8
68~82
50.2~60.5
19.3~19.7
0.76~0.78
19.05
3/4
100~120
73.8~88.5
23.6~24.0
0.93~0.94
In case of needing brazing, you must work with Nitrogen gas blowing.
Caution